Abstract: A hydroponic plant cultivation device is disclosed, wherein at least one rotating cultivation tower is arranged. The tower is formed by piling up a plurality of cultivation unit, each of which has a plurality of ports for allowing to receive and maintain a lower end of a plant to be cultivated, a nozzle for spraying a nutrient liquid therein, and a portion for accommodating a constant amount of the liquid to allow an overflow of any excess liquid to a lower cultivation unit. The nutrient liquid is measured on and adjusted in its concentration and pH and recycled between the tower and its supply source.